US20120169654A1 - Touch sensing apparatus - Google Patents

Touch sensing apparatus Download PDF

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Publication number
US20120169654A1
US20120169654A1 US13/293,951 US201113293951A US2012169654A1 US 20120169654 A1 US20120169654 A1 US 20120169654A1 US 201113293951 A US201113293951 A US 201113293951A US 2012169654 A1 US2012169654 A1 US 2012169654A1
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US
United States
Prior art keywords
driving
sensing
high voltage
control module
control signal
Prior art date
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Abandoned
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US13/293,951
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English (en)
Inventor
Chien-Yu Chan
Hung Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raydium Semiconductor Corp
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Raydium Semiconductor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Assigned to RAYDIUM SEMICONDUCTOR CORPORATION reassignment RAYDIUM SEMICONDUCTOR CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAN, CHIEN-YU, LI, HUNG
Publication of US20120169654A1 publication Critical patent/US20120169654A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the present invention relates generally to a liquid crystal display; particularly, the present invention relates to a mutual capacitance touch sensing apparatus utilizing the sensing switch component at medium/low voltage level to minimize the space area occupied by the high voltage device and to decrease the cost.
  • TFT LCDs thin film transistor liquid crystal displays
  • LCDs are widely used in TVs, flat displays, cell phones, tablet PCs, projectors, and other related electronic devices.
  • touch sensors play an important role among all other modules, and performance of the touch sensor affects the overall performance of LCD.
  • the conventional LCD having mutual capacitance touch sensing function includes a display panel, a conductive thin film sensor (like ITO sensor), and a touch control chip, wherein the conductive thin film sensor includes a plurality of sensing lines and a plurality of driving lines, and the touch control chip includes a plurality of pins.
  • the sensing lines are coupled with the pins respectively.
  • the driving line transmits a driving pulse to couple a small voltage at the sensing line
  • the touch control chip will sense the coupled voltage and determine according to the magnitude of the coupled voltage whether the conductive thin film sensor is touched.
  • the pin of the touch sensing apparatus can execute a sensing function or a driving function on the conductive thin film sensor.
  • the pin executes the sensing function on the sensing line of the conductive thin film sensor
  • the pin merely utilizes a medium/low voltage.
  • the pin executes the driving function on the driving line of the conductive thin film sensor
  • the pin needs to output a driving voltage at high voltage level to the driving line of the conductive thin film sensor, resulting in the pin utilizing the high voltage.
  • the present touch sensing apparatus does not isolate a sensing switch component from a driving switch component, the conventional sensing switch components are still selected from high-voltage components to avoid that the sensing switch components are damaged by the driving voltage at high voltage level, resulting in the increased cost of the touch sensing apparatus.
  • the present invention provides a touch sensing apparatus to minimize the space area occupied by the high voltage device and to decrease the cost.
  • the touch sensing apparatus includes a plurality of pins, a logic control module, and at least one driving/sensing control module.
  • the logic control module generates a driving control signal and an isolating control signal.
  • the at least one driving/sensing control module is coupled with the pins and the logic control module, wherein the driving/sensing control module controls at least one of the pins to execute the driving function according to the driving control signal at high voltage level and output a high voltage to a conductive thin film sensor.
  • the driving/sensing control module includes an isolating switch, a high voltage device, and a medium/low voltage device, wherein the isolating switch is coupled with the high voltage device and the medium/low voltage device.
  • the touch sensing apparatus further includes a level shifter coupled with the logic control module and the driving/sensing control module, wherein the level shifter converts the isolating control signal at medium/low voltage level outputted from the logic control module into the isolating control signal at high voltage level and transmits the isolating control signal at high voltage level to the driving/sensing control module.
  • the driving/sensing control module activates the isolating switch according to the isolating control signal to isolate the medium/low voltage device from the high voltage device, avoiding the high voltage from entering into the medium/low device.
  • the logic control module transmits a sensing control signal to the driving/sensing control module, and the driving/sensing control module controls the pins to execute the sensing function according to the sensing control signal at medium/low voltage level for sensing a plurality of analog data through a plurality of sensing lines of the conductive thin film sensor.
  • the touch sensing apparatus of the present invention utilizes the logic control module to generate the isolating control signal at medium/low voltage level.
  • the touch sensing apparatus further utilizes the level shifter to convert the isolating control signal at medium/low voltage level into the isolating control signal at high voltage level and transmit the isolating control signal at high voltage level to the driving/sensing control module.
  • the driving/sensing control module controls the isolating switch according to the isolating control signal at high voltage level to isolate the medium/low voltage device from the high voltage device for avoiding the high voltage from entering into the medium/low voltage device.
  • the touch sensing apparatus of the present invention can utilize the sensing switch component at medium/low voltage level to minimize the space area occupied by the high voltage device, further decreasing the cost of the touch sensing apparatus.
  • FIG. 1 is a schematic view of one embodiment of a touch sensing apparatus for sensing the touch point on a display panel
  • FIG. 2 is a schematic view of the driving/sensing control module of the touch sensing apparatus of the present invention.
  • One embodiment according to the present invention is a touch sensing apparatus.
  • the touch sensing apparatus is a mutual capacitance touch sensing apparatus, but not limited thereto.
  • FIG. 1 is a schematic view of a touch sensing apparatus 1 for sensing the touch point on a display panel.
  • a liquid crystal display (LCD) panel includes a conductive thin film sensor 100 and the touch sensing apparatus 1 .
  • the LCD panel is generally attached below the conductive thin film sensor 100 , but the location of the LCD panel is not limited to the embodiment.
  • the touch sensing apparatus 1 includes a logic control module 10 , a plurality of pins 20 , at least one driving/sensing control module 30 , at least one level shifter 40 , an amplifying module 50 , and an analog/digital conversion module 60 .
  • Each driving/sensing control module 30 is coupled with the pins 20 and the amplifying module 50 .
  • the level shifter 40 is coupled with the driving/sensing control module 30 and the logic control module 10 .
  • the analog/digital conversion module 60 is coupled with the amplifying module 50 and the logic control module 10 .
  • the pins 20 included in the touch sensing apparatus 1 not only have a single function, but can switch between different functions based on practical requirements.
  • these functions include, but are not limited to, driving function, sensing function, ground function, or floating function.
  • the conductive thin film sensor 100 includes a plurality of sensing lines 80 and a plurality of driving lines 90 , wherein the driving lines 90 are arranged perpendicular to the sensing lines 80 .
  • the driving lines 90 and the sensing lines 80 can be interchanged with each other; in other words, the driving lines 90 shown in FIG. 1 can actually be the sensing lines, and the sensing lines 80 shown in FIG. 1 can actually be the driving lines, wherein the disposition can be controlled by the touch sensing apparatus 1 .
  • each driving/sensing control module 30 includes an isolating switch SW 1 , a medium/low voltage device 301 , and a high voltage device 302 .
  • the isolating switch SW 1 is coupled with the medium/low voltage device 301 and the high voltage device 302 .
  • the high voltage device 302 includes a plurality of driving switches, and the driving switches utilize the high voltage.
  • the high voltage utilized in the touch sensing apparatus 1 is larger than 5V, and the medium/low voltage is less than 5V, but there is no limitation to the high voltage and the medium/low voltage.
  • the logic control module 10 generates a driving control signal and an isolating control signal.
  • the level shifter 40 converts the driving control signal at medium/low voltage level into the driving control signal at high voltage level and transmits the driving control signal at high voltage level to the driving/sensing control module 30 .
  • the driving/sensing control module 30 controls at least one of the pins 20 to execute the driving function according to the driving control signal at high voltage level and output the high voltage to the driving line 90 of the conductive thin film sensor 100 .
  • the logic control module 10 When the outputted voltage is at high voltage level, the logic control module 10 will transmit the isolating control signal at medium/low voltage level to the level shifter 40 , and the level shifter 40 converts the isolating control signal at medium/low voltage level into the isolating control signal at high voltage level and transmits the isolating control signal at high voltage level to the driving/sensing control module 30 .
  • the driving/sensing control module 30 activates (turns on) the isolating switch SW 1 according to the isolating control signal at high voltage level to isolate the medium/low voltage device 301 from the high voltage device 302 , avoiding the high voltage from entering into the medium/low voltage device 301 .
  • each driving/sensing control module 30 will control the pins 20 to execute the sensing function according to the sensing control signal at medium/low voltage level, so that a plurality of analog data can be sensed through the sensing the lines 80 of the conductive thin film sensor 100 .
  • the driving/sensing control module 30 can deactivate (turn off) the isolating switch SW 1 .
  • the touch sensing apparatus 1 includes the amplifying module 50 .
  • the amplifying module 50 amplifies the analog data outputted from the driving/sensing control module 30 .
  • the conductive thin film sensor 100 will execute a discharge process for avoiding the residual charge of the conductive thin film sensor 100 influences the sensing accuracy of the pins 20 .
  • the touch sensing apparatus 1 includes the analog/digital conversion module 60 , wherein the analog/digital conversion module 60 converts the amplified analog data into a digital data and transmits the digital data to the logic control module 10 .
  • the amplifying module 50 can be an arbitrary type of amplifier
  • the analog/digital conversion module 60 can be an arbitrary type of analog/digital converter
  • the amplifying module 50 and the analog/digital conversion module 60 are not limited to the embodiment.
  • FIG. 2 is a schematic view of one driving/sensing control module 30 of the touch sensing apparatus 1 of the present invention.
  • the driving/sensing control module 30 of the touch sensing apparatus 1 includes the medium/low voltage device 301 , the isolating switch SW 1 , and the high voltage device 302 .
  • the isolating switch SW 1 is coupled with the medium/low voltage device 301 and the high voltage device 302 .
  • the medium/low voltage device 301 includes a sensing switch SW 3 and a ground switch SW 4 .
  • the high voltage device 302 includes a driving switch SW 2 .
  • the driving switch SW 2 is coupled with a driving/sensing pin P 1 , the isolating switch SW 1 , and the level shifter 40 .
  • the isolating switch SW 1 is coupled with the driving/sensing pin P 1 , the driving switch SW 2 , the sensing switch SW 3 , and the ground switch SW 4 .
  • the sensing switch SW 3 is coupled with the isolating switch SW 1 , the ground switch SW 4 , and the amplifying module 50 .
  • the ground switch SW 4 is coupled with the isolating switch SW 1 , the sensing switch SW 3 , and a ground end.
  • the driving/sensing pin P 1 is coupled with the isolating switch SW 1 and the high voltage device 302 .
  • the isolating switch SW 1 , the driving switch SW 2 , the sensing switch SW 3 , and the ground switch SW 4 are all activated, i.e. in activation state.
  • the driving/sensing control module 30 When the logic control module 10 transmits the driving control signal at medium/low voltage level to the level shifter 40 , the driving/sensing control module 30 will control the driving switch SW 2 to be deactivated, and the level shifter 40 will convert the driving control signal at medium/low voltage level to the driving control signal at high voltage level and will transmit the driving control signal at high voltage level to the driving/sensing pin P 1 .
  • the driving/sensing control module 30 controls the driving/sensing pin P 1 to execute the sensing function according to the driving control signal at high voltage level and output the high voltage to the driving line 90 of the conductive thin film sensor 100 .
  • the high voltage utilized in the touch sensing apparatus 1 is larger than 5V, but not limited thereto.
  • the level shifter 40 converts the isolating control signal at medium/low voltage level into the isolating control signal at high voltage level, and transmits the isolating control signal at high voltage level to the driving/sensing control module 30 .
  • the driving/sensing control module 30 activates the isolating switch SW 1 according to the isolating control signal at high voltage level to isolate the medium/low voltage device 301 from the high voltage device 302 , avoiding the high voltage from entering into the sensing switch SW 3 and the ground switch SW 4 .
  • each driving/sensing control module includes a plurality of driving switches and a plurality of sensing switches.
  • the driving switches can connect corresponding level shifters, respectively.
  • the touch sensing apparatus of the present invention utilizes the logic control module to generate the isolating control signal at medium/low voltage level, utilizes the level shifter to convert the isolating control signal at medium/low voltage level into the isolating control signal at high voltage level and transmit the isolating control signal at high voltage level to the driving/sensing control module.
  • the driving/sensing control module controls the isolating switch according to the isolating control signal at high voltage level to isolate the medium/low voltage device from the high voltage device for avoiding the high voltage from entering into the medium/low voltage device.
  • the touch sensing apparatus of the present invention can utilize the sensing switch component at medium/low voltage level to minimize the space area occupied by the high voltage device, further decreasing the cost of the touch sensing apparatus.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Position Input By Displaying (AREA)
US13/293,951 2011-01-04 2011-11-10 Touch sensing apparatus Abandoned US20120169654A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW100100186A TWI439895B (zh) 2011-01-04 2011-01-04 觸控感測裝置
TW100100186 2011-01-04

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CN (1) CN102591508A (zh)
TW (1) TWI439895B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108376531A (zh) * 2018-02-28 2018-08-07 昆山国显光电有限公司 一种显示面板及其控制方法、显示装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI584170B (zh) * 2016-01-08 2017-05-21 Egalax_Empia Tech Inc Applies to the touch screen controller

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060055515A1 (en) * 2004-09-06 2006-03-16 Fujitsu Component Limited Tactile presenting device
US20100253638A1 (en) * 2009-04-06 2010-10-07 Marduke Yousefpor Integrated Touch Sensitive Display Gate Driver
US20100321320A1 (en) * 2009-06-17 2010-12-23 Sitronix Technology Corp. Touch panel with discharging function

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200905538A (en) * 2007-07-31 2009-02-01 Elan Microelectronics Corp Touch position detector of capacitive touch panel and method of detecting the touch position
CN101593065B (zh) * 2008-05-27 2011-01-19 宸鸿光电科技股份有限公司 电容式触控装置及其方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060055515A1 (en) * 2004-09-06 2006-03-16 Fujitsu Component Limited Tactile presenting device
US20100253638A1 (en) * 2009-04-06 2010-10-07 Marduke Yousefpor Integrated Touch Sensitive Display Gate Driver
US20100321320A1 (en) * 2009-06-17 2010-12-23 Sitronix Technology Corp. Touch panel with discharging function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108376531A (zh) * 2018-02-28 2018-08-07 昆山国显光电有限公司 一种显示面板及其控制方法、显示装置

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Publication number Publication date
TW201229834A (en) 2012-07-16
CN102591508A (zh) 2012-07-18
TWI439895B (zh) 2014-06-01

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AS Assignment

Owner name: RAYDIUM SEMICONDUCTOR CORPORATION, TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHAN, CHIEN-YU;LI, HUNG;REEL/FRAME:027230/0044

Effective date: 20110915

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION